Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK CLUTCH PRESSURE SWITCH SIGNAL 

   With CONSULT 

   1. Start engine.
   2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT.
   3. Read out ON/OFF switching action of the CL PRES SW while operating 4WD shift switch.

      Condition		Display value
      Ignition switch: ON A/T selector lever D position	4WD shift switch: AUTO or 4H (Wait function is not operating.)	ON
      Ignition switch: ON	4WD shift switch: 2WD (Wait function is not operating.)	OFF

   Without CONSULT 

   1. Start engine.
   2. Check voltage between transfer control unit harness connector terminals and ground.

      Connector	Terminal	Condition		Voltage (Approx.)
      E143	34 - Ground	Ignition switch: ON A/T selector lever D position	4WD shift switch: AUTO or 4H (Wait function is not operating.)	0V
      		Ignition switch: ON	4WD shift switch: 2WD (Wait function is not operating.)	Battery voltage

      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO  5.

      NO: GO TO 2.

2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND CLUTCH PRESSURE SWITCH 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness connector.
   3. Check continuity between transfer control unit harness connector E143 terminal 34 and transfer terminal cord assembly harness connector F56 terminal 7.

      Continuity should exist. 

      Also check harness for short to ground and short to power.

      Are inspection results normal? 

      YES: GO TO 3.

      NO: Repair or replace damaged parts.

      Fig 2: Checking Continuity Between Transfer Control Unit Harness Connector E143 Terminal 34 And Cord Assembly Harness Connector F56 Terminal 7

      Courtesy of NISSAN NORTH AMERICA, INC.
3. CHECK TRANSFER CONTROL UNIT 

   Check transfer control unit input/output signal. Refer to "REFERENCE VALUE ".

   Are inspection results normal? 

   YES: GO TO 4.

   NO: Check transfer control unit pin terminals for damage or loose connection with the harness connector. If any items are damaged, repair or replace damaged parts.

4. CHECK CLUTCH PRESSURE SWITCH 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Remove clutch pressure switch. Refer to "COMPONENT PARTS LOCATION ".
   3. Push and release clutch pressure switch and check continuity between terminal 7 and ground.

      Terminal	Condition	Continuity
      7 - Ground	Push clutch pressure switch	Yes
      	Release clutch pressure switch	No

      Are inspection results normal? 

      YES: GO TO 5.

      NO: Replace clutch pressure switch.

5. CHECK DTC 

   Perform the self-diagnosis, after driving a vehicle for a while.

   Are inspection results normal? 

   YES: GO TO 6.

   NO: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

6. CRUISE TEST 

   Perform cruise test. Refer to "PRELIMINARY CHECK ".

   Are inspection results normal? 

   YES: Inspection End.

   NO: Perform the applicable trouble diagnosis.